class hashPtr:
    Block_ptr = None
    hashNumber = None

class Block:
    def __init__(self):
        self.parentHash=None
        self.stateRoot=None
        self.transactionsRoot=None
        self.receiptsRoot=None
        self.logBloom=None
        self.number=None
        self.timestamp=None
        self.gasLimit=None
        self.gasUsed=None
        self.extraData=None
        self.transactions=[]

